Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151...27f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 1, Oct. 1985, p. 27-32.
Astronomy and Astrophysics
Astrophysics
15
H Lines, Infrared Spectra, Stellar Envelopes, Stellar Mass Ejection, Stellar Spectra, Stellar Winds, Balmer Series, Continuous Spectra, Ionized Gases, Radio Stars, Spectral Line Width, Stellar Models
Scientific paper
Infrared spectroscopic measurements of the ionized envelope surrounding P Cygni in the hydrogen lines Br-alpha, Br-gamma and Pf-gamma, with a resolution lambda/Delta lambda = 800, are presented. IR and radio continuum data collected from the literature are used to determine the parameters of the mass loss, using a power law approximation for the velocity profile. In the frame of the same model the results are used to study the observed line equivalent widths. The analysis leads to a set of bn values which indicate an overpopulation of the lower levels with respect to the LTE values, as expected in a situation of high optical depth. The problem of the envelope ionization and the effect of Balmer continuum photoionization from the n = 2 level are briefly discussed. The observed variability of radio fluxes may be due to occasional increase in the mass loss that makes the outer part of the wind neutral.
Felli Marcello
Oliva Ernesto
Panagia Nino
Stanga Ruggero
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